from bisect import bisect_left
class Solution:
    def maxEnvelopes(self, envelopes) -> int:
        if len(envelopes) == 0:
            return 0
        envelopes.sort(key=lambda x:(x[0],-x[1]))
        envelopes = [x[1] for x in envelopes]
        # print(envelopes)
        dp = []
        for i in range(len(envelopes)):
            idx = bisect_left(dp, envelopes[i])
            if idx == len(dp):
                dp.append(envelopes[i])
            else:
                dp[idx] = envelopes[i]
        return len(dp)

if __name__ == '__main__':
    so = Solution()
    # envelopes = [[305,5695],[5137,9778],[1677,3872],[29,6603],[7962,7773],[5828,6920],[6749,8831],[6502,636],[3416,1614],[3205,9375],[6835,6630],[3011,8382],[7054,9711],[1594,5130],[534,1729],[3710,2561],[1066,8697],[1568,954],[6827,8045],[2628,8225],[8789,5165],[8941,9065],[7302,6219],[1105,7566],[6686,5258],[5420,1026],[5144,6990],[3554,3563],[2336,9295],[2620,8304],[5168,4019],[6190,7856],[6103,440],[3213,5770],[6357,8769],[3585,1076],[4501,3239],[4744,7511],[1063,1071],[6166,5111],[9673,3268],[3356,3258],[5429,1627],[5413,8738],[3412,77],[4839,2817],[3379,3969],[5214,5841],[9128,7274],[3237,8785],[2143,1341],[2387,4730],[1781,1786],[8569,1803],[3077,837],[4639,8544],[7657,4370],[7945,9909],[3900,8965],[6945,9805],[7774,8739],[3941,3559],[8349,450],[1336,9883],[1280,3686],[2997,4483],[6621,6123],[6005,4503],[3277,214],[5757,3469],[2595,1655],[1893,5081],[3391,6186],[2908,4092],[5405,941],[121,8252],[6772,5177],[7045,880],[9123,9],[7351,1818],[7309,5714],[9688,5443],[3076,856],[9296,156],[1236,8154],[1369,7356],[5247,8314],[6852,2173],[2798,7839],[6854,2717],[1163,6595],[3009,1433],[628,7672],[9505,1980],[7096,304],[8962,8502],[8633,7407],[5061,5583],[7834,1717],[5649,6185],[8470,6411],[8778,1379],[7065,5246],[959,5340],[1214,8599],[9942,8452],[8746,6600],[7482,656],[5029,2987],[1385,1563],[6872,4319],[5970,863],[5733,8030],[4975,2151],[7635,8854],[2047,3278],[2026,139],[282,8362],[3545,8418],[5643,7870],[3128,755],[9551,7652],[6406,1892],[4760,2088],[352,6288],[9775,8714],[3097,9099],[6459,2164],[5902,8927],[4403,9266],[534,1479],[6640,5031],[8633,2922],[3982,2109],[7245,1119],[9517,6321],[7895,2481],[3548,2498],[7278,2718],[1020,1346],[91,3519],[353,103],[1328,7190],[6312,2459],[6751,3581],[9511,1074],[3261,2032],[5397,8133],[8281,4795],[3304,349],[1114,1155],[3685,842],[3192,6650],[3802,7029],[9155,3581],[704,6027],[2748,386],[1180,3270],[3822,1837],[7835,2026],[467,3972],[3649,1320],[1939,3856],[8013,1695],[9434,9990],[9220,4222],[1789,807],[8295,7512],[5606,8554],[4114,743],[5175,9099],[4652,4730],[7015,3503],[8656,5776],[2109,302],[8767,7198],[5695,323],[3113,8782],[5076,2296],[5130,6002],[5979,3238],[5961,1927],[8739,4678],[1548,8286],[7245,3924],[2726,4832],[5383,6319],[5270,3465],[7215,1696],[1886,9827],[4380,7621],[1846,1425],[6455,4700],[8709,4662],[8288,7738],[2232,4526],[4266,5468],[2524,2599],[9133,3419],[3603,6305],[5761,5916],[9242,2139],[8211,1450],[2195,7221],[7417,9222],[5376,682],[6002,32],[3442,9301],[6182,5205],[4373,8368],[8694,9400],[1601,4918],[3178,3968],[5804,43],[759,1129],[3134,2906],[3494,1066],[6424,7769],[335,704],[3106,8943],[3391,5881],[9025,1973],[8497,5743],[1023,648],[7397,7910],[559,9724],[6367,4504],[2459,6694],[9879,5983],[2923,3641],[590,661],[2385,5277],[1712,9336],[5565,5658],[7285,3963],[5515,4226],[5059,1080],[4201,533],[9515,1753],[2944,9143],[947,8741],[8354,4423],[9051,1445],[3539,5009],[6394,710],[6141,6414],[637,9066],[6461,4580],[3585,870],[1625,1540],[9688,1619],[7243,7561],[4939,9811],[7827,3861],[5813,1837],[5126,2947],[9524,9199],[1024,5629],[5312,7496],[5850,347],[3181,31],[2580,9047],[6025,1202],[259,6931],[7368,9338],[4618,9339],[3783,7064],[1521,9942],[5273,689],[8318,4412],[8661,8701],[3003,4958],[3464,6536],[3335,2490],[9010,332],[623,6653],[6201,9512],[4846,31],[3671,3629],[8390,3233],[9686,7291],[2366,416],[7904,8616],[7865,1047],[2355,5476],[2212,6085],[3717,9196],[1909,690],[9084,4005],[5317,9027],[130,7199],[386,7541],[9248,9248],[9688,9222],[5484,9675],[4529,3570],[5618,800],[1015,1202],[9874,3304],[5818,6771],[4729,3285],[7586,1666],[7202,5290],[5558,1910],[8759,493],[1856,2658],[2763,2497],[9254,9770],[6757,3068],[9762,6399],[4043,2579],[1639,5058],[5910,3210],[5932,8021],[3873,1152],[9541,4982],[644,1032],[4379,2091],[2718,8777],[181,7961],[3632,5390],[5160,8607],[9068,4397],[7468,7233],[8000,6822],[1289,810],[2391,5292],[9293,5822],[5786,2401],[5328,8279],[7060,2355],[3509,8489],[6098,632],[6708,3478],[3243,3612],[2947,9890],[8622,9281],[7931,6082],[469,3226],[3542,280],[4872,9514],[8884,7258],[5623,6865],[8036,434],[8050,5701],[1671,4632],[197,7746],[7699,7979],[4239,6114],[5954,561],[6922,147],[4263,1296],[4325,9242],[9369,9459],[4296,4406],[4456,8305],[3979,1744],[6259,5733],[5543,1675],[7336,9050],[1213,782],[5574,5551],[8000,2010],[9893,6506],[261,830],[8608,6615],[1828,6888],[8662,1865],[7711,3707],[5260,2604],[6507,6536],[6896,2720],[2312,7768],[7381,316],[9169,1031],[8825,7126],[2090,480],[3180,1691],[2221,377],[9220,7724],[9181,9846],[4558,4608],[4293,1734],[1589,2446],[1859,1921],[4897,5732],[7557,4417],[7284,4321],[8346,5610],[4941,7169],[7845,2521],[2187,1351],[1997,723],[9798,7453],[8319,3043],[6489,8681],[1708,2593],[9154,6592],[9211,6844],[567,1827],[8648,2490],[3405,5748],[4747,3409],[8757,1141],[9052,2517],[5857,8823],[9109,6845],[759,1332],[6131,6249],[8618,1436],[966,521],[1755,8909],[4788,7627],[3904,9689],[6331,9757],[1207,7363],[6638,4111],[4595,4327],[8974,8356],[1680,6705],[9722,3589],[2501,4037],[517,968],[949,3967],[16,5815],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26],[6658,2752],[9696,8408],[1420,217],[7059,3453],[3261,7513],[6578,6152],[4693,2769],[649,8868],[6336,2497],[3280,7712],[7260,2674],[1488,686],[9853,828],[9275,7108],[340,9105],[8357,5431],[8650,5394],[3690,5091],[1807,1904],[7460,4151],[7766,1526],[7548,4933],[8266,480],[2272,1348],[5010,3728],[1901,9313],[748,9633],[9001,3880],[4554,274],[5084,8744],[102,6736],[7439,551],[6350,6204],[3539,2384],[1818,9917],[6356,3957],[5984,4402],[3369,1723],[2846,3237],[3822,2871],[3640,9973],[4540,9676],[316,5553],[3173,8830],[5966,1902],[3641,9078],[6007,9101],[4630,8888],[1832,711],[19,2333],[5649,8134],[3873,5542],[6442,7371],[9830,5759],[9341,6160],[7561,4522],[6647,1923],[5203,9974],[4911,7575],[4811,9194],[7400,1401],[4529,2352],[3681,894],[556,6083],[3212,7751],[9041,8048],[9711,9943],[9678,9160],[9170,4530],[4803,405],[5456,5646],[5811,7170],[107,7342],[9732,9701],[3674,8491],[4390,1934],[5136,748],[4369,8371],[7521,4281],[4018,9226],[185,662],[817,742],[9354,245],[435,8599],[2533,1333],[7792,425],[8572,6020],[5791,1404],[9103,8045],[9872,505],[8805,872],[8413,2539],[2674,9309],[6054,7071],[6727,3391],[9161,5052],[4596,9956],[9189,7329],[8746,9915],[537,8584],[5485,2671],[6500,6819],[1316,6103],[8029,8586],[3963,5982],[5849,4469],[4372,684],[6712,7794],[5461,7332],[2440,937],[4726,3344],[7854,7581],[9786,4749],[9128,6635],[3079,7319],[8943,1305],[6707,9274],[7227,6309],[5493,1115],[6322,3981],[6592,5948],[49,6919],[2738,3949],[7083,3730],[7217,7447],[6773,8901],[9462,3688],[2758,4488],[3274,8513],[6416,9185],[8588,5725],[9194,8880],[2391,9617],[9112,4854],[4243,5375],[9667,8762],[1194,3925],[8314,9114],[948,22],[3830,3401],[2716,9952],[571,2050],[1126,3128],[5133,9966],[3098,6336],[6985,2097],[5657,6057],[9138,4299],[9753,5630],[419,9350],[842,9823],[4357,6204],[890,3034],[546,6348],[4422,1194],[5873,9300],[7592,9271],[3808,9877],[2326,2816],[862,8322],[5711,3018],[4254,4728],[4349,3568],[465,1380],[3583,168],[8306,9995],[2001,6508],[3048,4075],[7691,8969],[4809,7047],[7845,157],[3635,8282],[8707,1670],[6155,2874],[3271,5768],[8962,9449],[2946,1051],[13,9833],[7681,2685],[8679,2091],[8131,7834],[6347,2344],[717,2629],[9694,2483],[1793,4031],[9265,6402],[7024,4347],[5177,9425],[9053,7790],[3572,8093],[6691,5301],[2070,2833],[2069,9988],[7769,5622],[2523,9520],[6627,7649],[4255,2560],[1285,8029],[4888,5025],[7821,8364],[3546,2833],[1571,5020],[7712,8552],[5027,7537],[9435,8502],[7342,1294],[4380,7341],[6084,6454],[4222,2392],[4245,1939],[8692,9099],[5160,330],[8596,6225],[666,4897],[6845,551],[7815,16],[6942,2986],[8984,6791],[3082,55],[6244,5605],[6119,761],[7071,6136],[6582,4779],[6457,2165],[7221,8013],[3299,136],[5311,7718],[9933,4903],[5642,2698],[7509,8310],[6021,3345],[4364,2462],[6560,5594],[4831,3775],[7551,6490],[8624,3759],[3084,498],[9564,1541],[5752,7463],[1368,6822],[5905,5104],[2308,3316],[5692,467],[6979,3254],[9443,4685],[6853,2253],[1883,2239],[3721,14],[3715,6205],[9334,7522],[5194,265],[6051,6526],[2869,1964],[5674,8741],[1616,6740],[9128,5382],[7115,1046],[9549,1655],[8184,2238],[8137,9125],[349,4515],[2751,6814],[3145,1804],[4646,838],[6426,4194],[2613,8169],[6385,8624],[4745,8914],[8468,2404],[7844,4070],[2455,2289],[3082,7345],[4930,9499],[2678,1962],[4823,6338],[4271,4375],[3258,5500],[4672,1952],[4178,8395],[5483,8695],[9401,7425],[1975,7699],[2900,3474],[636,3668],[5410,1600],[7928,6214],[7150,5236],[5937,6968],[2344,8954],[1011,1269],[9662,1624],[9640,5862],[7641,7331],[780,8450],[3951,1384],[7167,373],[410,7940],[8140,9331],[4747,1406],[9031,7437],[659,4465],[8492,8319],[1382,4319],[5635,6785],[9021,4447],[8142,3997],[3125,4999],[3779,2575],[2985,4769],[5196,5916],[9798,8037],[8820,7402],[7303,2040],[4754,1550],[9336,1259],[6275,5466],[6039,645],[2946,8643],[4018,5153],[4163,4343],[8525,2472],[2927,4939],[4852,1428],[4514,6274],[7875,6693],[8654,3688],[111,4572],[1728,7221],[2881,7090],[1443,8109],[135,3336],[2360,9475],[3137,9340],[9519,8397],[87,4254],[4840,7518],[6393,1718],[9880,3486],[3141,5537],[1427,453],[8487,7876],[9093,274],[9275,8823],[2023,989],[5457,1097],[3056,8836],[533,3218],[7360,3341],[1070,3905],[7798,4345],[5763,7895],[9976,9077],[5949,1649],[8085,6487],[8001,4385],[5038,8443],[4225,4155],[3291,8935],[8695,8789],[9730,5535],[2717,9573],[8743,6325],[1546,5982],[4221,1378],[606,7585],[2935,4013],[8434,9993],[4705,6226],[1084,8358],[6093,431],[8044,6619],[4958,6822],[733,1202],[7649,4378],[4515,8631],[3192,2333],[630,9187],[2050,7010],[4255,3043],[53,7494],[9202,2224],[2508,2669],[2035,2875],[8042,2057],[4995,3784],[4465,3986],[6184,7485]]
    envelopes = [[5,4],[6,4],[6,7],[2,3]]
    r = so.maxEnvelopes(envelopes)
    print(r)
